Friedensreich Hundertwasser (December 15, 1928 – February 19, 2000) was an Austrian artist; he became one of the best-known contemporary Austrian artists by the end of the 20th century.
The common themes in his work utilized bright colors, organic forms, and a strong individualism, rejecting straight lines. He was fascinated by spirals, and called straight lines "the devil's tools". He called his theory of art "transautomatism", focusing on the experience of the viewer, rather than the artist.
In 1999 Hundertwasser started his last project named Die Grüne Zitadelle von Magdeburg. Although he never finished this work completely, the building was built a few years later in Magdeburg and opened on October 3, 2005.
There are several of his buildings in Germany, Die Grüne Zitadelle is the second one I’ve seen. The first one was last year in Ulzberg, ,the Bahnhof (train station) was also amazing!